WTB Bronson AM TCS 26 Mountain Tire. Tackle any trail. The WTB Bronson AM TCS 26x2.3 Mountain Tire is made with a widely spaced, linked tread to eat up rough, rocky trails, loose dirt and hardpack. And for those who really push the limits out on the trail, this edition of the Bronson features WTB's All Mountain casing which protects the sidewall from abrasions plus it's set up to run tubeless. If you ride a wide variety of terrain, you'll be hard pressed to find a better set of tires for your rig.